The metabolic profile of Bifidobacterium dentium reflects its status as a human gut commensal

Melinda A. Engevik, Heather A. Danhof, Anne Hall, Kristen A. Engevik, Thomas D. Horvath, Sigmund J. Haidacher, Kathleen M. Hoch, Bradley T. Endres, Meghna Bajaj, Kevin W. Garey, Robert A. Britton, Jennifer K. Spinler, Anthony M. Haag, James Versalovic

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Background: Bifidobacteria are commensal microbes of the mammalian gastrointestinal tract. In this study, we aimed to identify the intestinal colonization mechanisms and key metabolic pathways implemented by Bifidobacterium dentium. Results: B. dentium displayed acid resistance, with high viability over a pH range from 4 to 7; findings that correlated to the expression of Na+/H+ antiporters within the B. dentium genome. B. dentium was found to adhere to human MUC2+ mucus and harbor mucin-binding proteins. Using microbial phenotyping microarrays and fully-defined media, we demonstrated that in the absence of glucose, B. dentium could metabolize a variety of nutrient sources. Many of these nutrient sources were plant-based, suggesting that B. dentium can consume dietary substances. In contrast to other bifidobacteria, B. dentium was largely unable to grow on compounds found in human mucus; a finding that was supported by its glycosyl hydrolase (GH) profile. Of the proteins identified in B. dentium by proteomic analysis, a large cohort of proteins were associated with diverse metabolic pathways, indicating metabolic plasticity which supports colonization of the dynamic gastrointestinal environment. Conclusions: Taken together, we conclude that B. dentium is well adapted for commensalism in the gastrointestinal tract.

Original languageEnglish (US)
Article number154
JournalBMC Microbiology
Volume21
Issue number1
DOIs
StatePublished - Dec 2021

Keywords

  • Acid stress
  • Bifidobacteria
  • Carbohydrates
  • Commensal
  • Glycans
  • Intestine
  • Metabolism

ASJC Scopus subject areas

  • Microbiology
  • Microbiology (medical)

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